Fawkes the Phoenix will adopt Harry. Now that Dumbledore, the previous owner of Fawkes, is dead (and yes, I believe he is truly dead and won’t return like Gandalf), I think there’s a good chance Harry could end up with a Phoenix as an animal companion.

Harry will kill Voldemort after finding and destroying the four remaining horcruxes. After re-reading the ending of Harry Potter and the Order of the Pheonix, in which Dumbledore explains the prophecy, I don’t think there’s a chance that it could now refer to Neville.

Harry’s scar will disappear. The scar was the connection to Voldemort, so at the time of Voldemort’s death it will vanish.

Severus Snape will sacrifice himself to save Harry. After re-reading the Half-Blood Prince, I believe that Dumbledore was wrong that Snape was on his side. The fact that Dumbledore was somewhat incorrect about the Horcrux in the cave (he didn’t know it had been removed already) serves to underscore his fallibility, thus lending credence to the theory that he was also wrong about Snape. That said, I think that Snape, unlike Voldemort, has the capacity to love, and truly feels guilty about Lily Potter’s murder (though perhaps not James’). Therefore, he will redeem himself in the end by helping Harry.

Draco will help Harry in some way. By the end of the Half-Blood Prince Harry feels sorry for Draco, with his previous dislike of Draco pushed out of the way by his overwhelming hatred of Snape. Although they’re unlikely to become friends, I think (or maybe hope) that Draco will come to realize Voldemort’s fundamental evilness and will help Harry in his quest to defeat him.

Hagrid will die. Harry has now lost his parents, his godfather (Sirius Black), and his mentor and father-figure (Dumbledore). Hagrid’s the adult remaining alive to whom Harry is closest, so following the pattern, he may lose his life in the final book.

Percy Weasley will make up with his family. I can’t believe that, when push comes to shove, a member of the Weasley family won’t come through in the end.

We’ll discover that Harry is related to Godric Gryffindor. This connection would be parallel to Voldemort’s descent from Salazar Slytherin. There have been hints, such as Harry’s use of Godric’s sword in The Chamber of Secrets, and the name, Godric’s Hollow, where Harry’s parents died.

Neville will use his herbology skills to help Harry defeat Voldemort.

Petunia will help Harry in some way. This help will include more than just allowing Harry back into her house one last time.

We’ll learn more about Dumbledore and his defeat of the dark wizard Grindelwald. Maybe also about Dumbledore’s brother Ableforth.

We’ll learn more about James and Lily Potter. I realize this is a bit vague, but there’s got to be more to the fact that Harry has his mom’s eyes.

The house-elves, or at least Dobby, will help Harry, rewarding him and Hermione for their kindness toward them.

Wormtail will repay his life-debt to Harry.

Reading through the predictions, I can see that I’m pretty optimistic about the outcome: Both Snape and Draco redeem themselves, none of the kids die, and Voldemort is defeated. Let’s see if J.K. Rowling agrees!